I plan on having a bank of 15 gal barrels with a shelf/table top on top of them. In addition I plan on using a electric water heater either tank type or point of use. I am going to run the hot water thru a pex coil in the tank and then to the barrels. I may apply the same method to cool by using a drinking fountain condensing unit. with all that said could you do the same only bury the barrels?